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Two cattle growth trials and two lamb metabolism trials were conducted to determine the value of blood meal (BM), meat meal (MM) and corn gluten meal (CGM) when fed in combination with urea. Supplements containing BM-urea, MM-urea, CGM-BM-urea and CGM-MM-urea produced weight gains superior (P<.05) to those obtained with urea. Feed intake was unaffected by supplemental protein source. The feeding of slowly degraded proteins with urea provided the most efficient conversion of feed to gain, as well as the most efficient conversion of protein to gain. The value of these sources of protein in relation to soybean meal was in the range of 161 to 216%. Results of two sheep metabolism trials showed that neither dry matter nor N digestibility was affected by protein source. Urea-supplemented animals had higher (P<.05) rumen ammonia levels than animals fed natural protein. There was considerable variation in acid detergent fiber, acid detergent insoluble N and ash among MM sources, which seemed to be the result of the different methods of processing and handling between packing plants.
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Stock et al. (1981) studied this question.
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